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HALSEYQH. MONROE, OF THOMASTON, MAINE.

Letters Patent No. 100,547, dated ll/[a/roh 8, 1870.

IMPROVEMENT IN REVOLVING- HARROW AThe Schedule referred toin these Letters Patent and making part of the same.

have invented certainnnew and useful Improvements in Revolving Harrowsg' and I do hereby declare the following to be a full, clear, and exact' descriptionofV the same, reference being `Vhad to the accompanying drawings making part of this specification, inwhich- Y ,Figure 1 is a side elevation, and

-Figure 2, a top 01 plan view of a revolving barrow, showing my improvement applied thereto.

` My invention *relatesv to that class of harrows in which the revolving motion 4is produced by aweight resting on one' side; and l A 'It consists in thevernployment of a sliding or adjustable weight upon an arm projecting laterally from the draftJbeam, by moving which, toward or from the center' or axis, the rotation of the harrow is regulated to adapt it to dii'erent soils, some of which, from their stiffness, require the effect of greater Weight to canse the harrow to revolve than those which are looser, and allow the teeth to penetrate freely and to a greater depth.

AAs represented inthe drawings- A is the draft-beam;

B, the rim of the barrow-frame; and

c c, the teeth. The beam is provided with the usual olevis,.D, or

other mode of attaching the whiletree,and is connected with the hub ot' the frame ,by a loose joint, whichiadmits of vertical motion, so that the frictionwheel j, at itsfrear extremity, always-bears upon the rim, .and yet admits ot' some play in passing over uneven surfaces 4of ground.

VvPi'voted to the journal i is an arm, h, projecting laterally a distance equal to the radius of the harrowrim, which isalso provided at its extremity. with a friction-wheel, g, which bears upon the rim B. A j

This arm is ordinarily placed at right angles to the direction ofthe beam A, and held by the brace 7a, but it may be fixed ohliquely thereto by adj ustng the end of the brace in different holes, Z Z, made to receive it.

Mounted upon the arm hin any suitable manner -is a weight, M, which is held by a set-screw, o, by loosening which the weight may be made t0 slide toward or from the axis, thereby changing the load to any part between the center and the periphery of the harrow. as the nature of the soil may require.

In iirm or stili` soils, in which the teeth do not read- Y ily penetrate, the weight is requir'edto be locatediat the extremity ofthe arm to make the harrow revolve properly, but in mellow soil it requires tobe adjusted inwardly toward the center, which is accomplished with the utmost facility by mydevice, enabling the operator to regulate the action of the harrow with. the precision of a steam-engine governor.

My improvement 'is readily applied to revolving i hai-rows already in use by a moderate amount of me- `chanical skill.

sisting of the weight M, sliding upon the arm h, or

its equivalent, substantially as and for the punpose rset forth.

' HALSEY H. MONROE.

Witnesses: V

KATE N. Jonas, J. FRASER. 

